x86-64 support for gas part I

[Alan Modra]

On Tue, 19 Dec 2000, Richard Henderson wrote:

> On Tue, Dec 19, 2000 at 12:18:51PM +1100, Alan Modra wrote:
> > > ! 		  disp = (((disp & 0xffffffff) ^ 0x80000000) - 0x80000000);
> > 
> > Constants in range 0x80000000 to 0xffffffff here need fixing.
> 
> No, this one's fine.  Either it's a 64-bit machine and the
> sign extension happens as planned, or it's a no-op.

No, we're worried about compiling on 32-bit machines with BFD64, and both
with old K&R compilers and ISO C compilers.

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